Exceeding milli-watt powering magneto-mechano-electric generator for standalone-powered electronics

Venkateswarlu Annapureddy, Suok Min Na, Geon Tae Hwang, Min Gyu Kang, Rammohan Sriramdas, Haribabu Palneedi, Woon Ha Yoon, Byung Dong Hahn, Jong Woo Kim, Cheol Woo Ahn, Dong Soo Park, Jong Jin Choi, Dae Yong Jeong, Alison B. Flatau, Mahesh Peddigari, Shashank Priya, Kwang Ho Kim, Jungho Ryu

Research output: Contribution to journalArticlepeer-review

104 Scopus citations


In contrast to typical magnetic energy generators that use electromagnetic induction, which are bulky and have low generation efficiency under small magnetic fields at low frequency, magneto-mechano-electric (MME) generators utilizing the magnetoelectric (ME) coupling effect and magnetic interactions are considered promising candidates. MME generators will serve as a ubiquitous autonomous energy source converting stray magnetic noise to useful electric energy for applications in wireless sensor networks (WSN) for the Internet of Things (IoT) and low-power-consuming electronics. The key component in a MME generator is the ME composite consisting of piezoelectric and magnetostrictive materials, which elastically couples the electric and magnetic behaviour of the respective constituent. Here, we report a MME generator consisting of a crystallographically oriented Pb(Mg1/3Nb2/3)O3-Pb(Zr,Ti)O3 piezoelectric single crystal macro-fibre composite and a highly textured magnetostrictive Fe-Ga alloy, which exhibits an exceptionally high rectified DC output power density of 3.22 mW cm-3. The large energy generation in this structure is ascribed to the coupling between the strong anisotropic properties of the piezoelectric single crystal fibres and textured Fe-Ga magnetostrictive alloy. A smart watch with IoT sensors was driven by the MME generator under a 700 μT magnetic field.

Original languageEnglish (US)
Pages (from-to)818-829
Number of pages12
JournalEnergy and Environmental Science
Issue number4
StatePublished - Apr 2018

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution


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